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Code Issues

Make VC 2013 x64 generate the same code as VC 2010 x64 : "lock xadd" instead of "lock add".

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There was hagnups in SS x64 during new nbackup locking testing without this patch.
Note, both 32-bit compilers generate "lock xadd" instructions.
This commit is contained in:
hvlad 2016-08-17 16:48:22 +03:00
parent 61a7560fe6
commit 9b0a730c78
1 changed files with 2 additions and 2 deletions
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4
src/common/classes/rwlock.h
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@ -112,13 +112,13 @@ public:
{ {
if (lock.value() < 0) if (lock.value() < 0)
return false; return false;
if (++lock > 0) if (lock.exchangeAdd(1) >= 0)
{ {
reason(aReason); reason(aReason);
return true; return true;
} }
// We stepped on writer's toes. Fix our mistake // We stepped on writer's toes. Fix our mistake
if (--lock == 0) if (lock.exchangeAdd(-1) == 1)
unblockWaiting(); unblockWaiting();
return false; return false;
} }